Voice frequency

From Wikipedia, the free encyclopedia

A voice frequency (VF) or voice band is one of the frequencies, within part of the audio range, that is used for the transmission of speech.

In telephony, the usable voice frequency band ranges from approximately 300 Hz to 3400 Hz. It is for this reason that the band of the electromagnetic spectrum between 300 and 3000 Hz is also referred to as "voice frequency" (despite the fact that this is electromagnetic energy, not acoustic energy). The bandwidth allocated for a single voice-frequency transmission channel is usually 4 kHz, including guard bands, allowing a sample rate of 8 kHz to be used as the basis of the pulse code modulation system used for the digital PSTN.

[edit] Fundamental frequency

The voiced speech of a typical adult male will have a fundamental frequency of from 85 to 155 Hz, and that of a typical adult female from 165 to 255 Hz[1][2]. Thus, the fundamental frequency of most speech falls below the bottom of the "voice frequency" band as defined above. However, enough of the harmonic series will be present for the missing fundamental to create the impression of hearing the fundamental tone.

[edit] References

  1. ^ Titze, I.R. (1994). Principles of Voice Production, Prentice Hall (currently published by NCVS.org), ISBN 978-0137178933.
  2. ^ Baken, R. J. (1987). Clinical Measurement of Speech and Voice. London: Taylor and Francis Ltd.

[edit] See also


An earlier version of this article contains public domain text originally from Federal Standard 1037C in support of MIL-STD-188.

Languages